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9,2
96%
Jaipur, India
$49 USD pr. time
8,6
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99%
Noida, Gautam Bhudha Nagar, India
$20 USD pr. time
9,2
9,2
100%
Karachi, Pakistan
$40 USD pr. time
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100%
BANGKOK, Thailand
$130 USD pr. time
8,8
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99%
Dubai, United Arab Emirates
$20 USD pr. time
10,0
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98%
Jaipur, India
$4 USD pr. time
9,4
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98%
Karachi, Pakistan
$20 USD pr. time
9,2
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98%
Surat, India
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Kharagpur, India
$8 USD pr. time
Leder du efter en API Integration Expert? Her er de bedst bedømte API Integration-projekter, der er blevet gennemført på Freelancer i denne måned, udvalgt på baggrund af verificerede kundeanmeldelser på 4,5 stjerner eller derover og opdateret hver måned.
PROJEKTET
The freelancer audited and upgraded a live Next.js AI platform, fixing RAG retrieval logic, Google Sheets API sync, and cross-selling to bind exact affiliate links to every AI suggestion. The client confirmed all features were deployed and tested ahead of expectations.
KLIENT-ANMELDELSE
Working with Mikhail has been an absolute pleasure. He is an exceptional full-stack developer who demonstrated high professionalism, deep technical expertise, and quick turnaround times across all project phases. From managing webhooks and AI flows to implementing UI features, sidebar updates, and the Meta Pixel settings dashboard, Mikhail delivered top-quality results. He is highly responsive, detail-oriented, and reliable. Highly recommended.
JavaScript · Website Design · HTML
PROJEKTET
A payment gateway bug in a Kotlin Android app was traced and resolved, with cards and wallets now processing correctly through to confirmed "paid" order status. The client noted clean delivery, clear communication, and no manual steps required post-fix.
KLIENT-ANMELDELSE
Great work! Diego [redacted] fully understood the project, communicated clearly throughout, and delivered right on time. Cards and wallets now go through cleanly and orders update to "paid" without any manual steps. Highly recommend, would hire again.
Java · Mobile App Development · iPhone
PROJEKTET
Shiprocket Checkout was integrated into a WooCommerce store, with shipping rates, courier selection, and automatic order sync all configured end to end. The client praised fast, professional delivery of a fully working checkout and shipping workflow.
KLIENT-ANMELDELSE
Excellent work! Implemented Shiprocket Checkout in my WooCommerce store within a few hours. Fast, professional, and highly recommended.
PHP · JavaScript · Testing / QA
PROJEKTET
A Flutter SMS parser was extended with a manual-entry form, validation, and REST API posting for unresolved transactions. Completed by a freelancer with a 100% completion rate across all three early-career reviews.
KLIENT-ANMELDELSE
Good work, i recomend
Mobile App Development · Android · Dart
API integration is the process of connecting two or more software systems through their application programming interfaces so they can exchange data and trigger actions automatically. An API integration expert designs, builds, and maintains these connections between web apps, databases, payment gateways, CRMs, and third-party services. Hiring an experienced API integration expert removes manual data entry, prevents sync errors, and lets your stack behave as one cohesive system.
Whether you need to wire Stripe into a custom checkout, push leads from a marketing form into Salesforce, or build a middleware layer that connects a legacy ERP to a modern e-commerce front end, an API integration specialist handles the authentication, data mapping, error handling, and ongoing monitoring that make integrations production-ready.
An API integration freelancer ships working, documented connections between systems — not just code snippets. The deliverables are concrete and testable, and they remove a measurable amount of manual work from your operations.
API integration work spans almost every category of modern software. Freelancers on Freelancer.com regularly handle integrations across the following systems and providers.
A capable API integration consultant works fluently across testing, documentation, and deployment tools. Look for hands-on familiarity with the following.
Almost every digital business reaches a point where systems must talk to each other. Common use cases include:
Strong candidates show evidence of both engineering discipline and integration-specific experience. When reviewing profiles and proposals, look for these signals:
Useful interview questions to ask shortlisted candidates:
Freelancer.com gives you access to a global pool of API developers, backend engineers, and integration consultants across every major language, framework, and SaaS ecosystem. You can compare profiles, portfolios, ratings, and verified reviews in one place, then post a project on Freelancer.com to receive competitive bids from freelancers who match your stack. Clients set their own budgets, and Milestone Payments hold funds securely until agreed deliverables are approved — so you only release payment once the integration works as specified. With round-the-clock coverage across time zones, you can keep an integration moving while your in-house team sleeps.
Ready to connect your systems and automate the data flow between them?
Hiring the right API integration specialist comes down to a clear brief, careful proposal review, and a final check on profile evidence. The steps below walk you through posting your integration project, reviewing bids, and awarding the work with confidence.
Your project post is the single biggest determinant of bid quality. A precise brief filters out generalists and attracts integration specialists who already know the APIs in your stack. Head to the
Bids are short proposals, not just price quotes. A strong bid for an API integration project shows that the freelancer has read the brief, understands the APIs involved, and has thought through the trickier parts — auth, pagination, error states, and edge cases. Use the proposal stage to shortlist candidates whose technical reasoning matches the work.
The final decision combines proposal quality with profile evidence. For API integration work, weigh consistency across multiple completed integrations rather than one standout project, and look for reviews that mention reliability, documentation quality, and post-launch support.
A simple one-way integration between two well-documented APIs can take a few days, while complex bi-directional syncs with custom business logic, transformations, and error handling can take several weeks. Timeline depends on API quality, data volume, authentication complexity, and how well the source and target schemas align.
Yes. Many integrations are scoped as fixed-deliverable projects — for example, connecting Stripe to a custom membership site or pushing form submissions into HubSpot. You can hire on Freelancer.com for a single integration and optionally retain the same freelancer on a maintenance basis once it ships.
Backend developers build server-side applications and databases from the ground up, while API integration experts specialize in connecting existing systems through their published interfaces. There is overlap, but integration specialists bring deeper familiarity with third-party API quirks, authentication standards, webhook patterns, and iPaaS platforms.
For most discrete integrations — a payment gateway, a CRM connector, a webhook listener — an experienced freelancer is faster and more cost-efficient than an agency. Larger initiatives involving multiple systems, ongoing support contracts, or strict compliance requirements may benefit from a small team, which you can also assemble through Freelancer.com.
Reputable API integration consultants deliver documentation as part of their scope, including architecture diagrams, environment variables, endpoint references, and runbooks for common failures. Make documentation an explicit deliverable in your brief so it is bid on and priced upfront.
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